configs: am65/j72x: Set CONFIG_LOGLEVEL to 7

configs: am65/j72x: Set CONFIG_LOGLEVEL to 7

By default CONFIG_LOGLEVEL seems to be set to 4 which is
too low and doesn't show dev_info/dev_notice/dev_warn
messages on console. This has been deliberately set low
globally to be conservative setting across the board due to
primary bootloader size limitations. It is best to tune
per board config as per user needs.

On K3 we have separate SPL and u-boot configs so we
can afford to set u-boot CONFIG_LOGLEVEL to 7.

On AM65 this patch causes u-boot.img size to change from
932KB to 940KB with 1 line additional print during
MMC boot. i.e. details of Net subsystem

"Net: K3 CPSW: nuss_ver: 0x6BA00102 cpsw_ver: 0x6BA80102 ale_ver: 0x00293904 Ports:1 mdio_freq:1000000"

Similar 8KB difference was seen on J721E.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Reviewed-by: Nishanth Menon <nm@ti.com>